02-01-2007, 08:54 PM | #1 |
3" Exhaust
Join Date: Jul 2006
Location: Seattle, WA
Posts: 73
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Still no boost...
So, I bought my 87 Supra Turbo for cheap ($1000) because the turbo wasnt spooling. I figured it'd be an easy fix. I pulled the turbo, checked for cracks, leaks, etc...and nothing. The turbo spins freely and no shaft play. Before I pulled the turbo, when I drove the car, there was a hissing coming from the turbo area like a leak somewhere. I figured it to be an exhaust leak. So when I put the turbo back on, I kept the downpipe unhooked and started up the car. The hissing was gone, but still no boost. I havent thouroghly inspected the IC piping yet, but that might be the problem. My question is, would an exhaust leak keep the turbo from spooling and give the car no power, or would that be a leak somewhere else? Also, if I had a vacuum leak, would the car die right away, or would it still run, but miss-fire terribly? I would really like to get in touch with a knowledgeable someone in the Seattle-Everett area and just have them come check my car out. As always, money is tight, and a helping hand would be greatly appreciated. Thanks.
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1987 Supra Turbo GReddy TT Open Element Filter (<---not sure what brand) YAY BOOST!!!!....finally... |
02-01-2007, 10:44 PM | #2 |
3" Exhaust
Join Date: Feb 2005
Location: B.C Canada
Posts: 77
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im not, sure but have you checked the Blow off valve, maybe its stuck open or something. i'm not entirly sure, but worth a look at, its easy to get and they arnt too expencive.
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to much pizza makes me feal sick |
02-01-2007, 11:04 PM | #3 |
3" Exhaust
Join Date: Jul 2006
Location: Seattle, WA
Posts: 73
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What does the stock BOV look like? Is it the selenoid lookin thingy on that one BOV hose? Also, The sound was coming more from the downpipe area. I think I just might have a bad intercooler or hoses. But Ill check that. Thanks.
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1987 Supra Turbo GReddy TT Open Element Filter (<---not sure what brand) YAY BOOST!!!!....finally... |
02-02-2007, 05:25 PM | #4 |
20psi boost
Join Date: May 2006
Location: New Haven/Hamden
Posts: 793
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What makes you think you are making no boost? The stock gauge always reading -4? Why don't you hook up an aftermarket MECHANICAL boost gauge, not an electric one. Then take it from there.
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02-02-2007, 06:50 PM | #5 | ||
3" Exhaust
Join Date: Oct 2005
Location: Tuscaloosa, AL
Posts: 53
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Quote:
is it not spooling, or just not boosting? when you get on it, do you hear the turbo spool but still no boost kick? if it's spooling but not boosting, check the BOV.
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02-02-2007, 07:17 PM | #6 |
3" Exhaust
Join Date: Feb 2007
Location: Milwaukee, WI
Posts: 174
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an exhaust leak would indefinately keep your turbo from spooling. Although only to a certain extent. You could have all kinds of leaks to keep you from spooling. I realistically could be spooling and you just have a real bad boost leak. Aka anywhere from the lower ic pipe to the upper ic pipe to the ic itself. Your bov could have a leak, intake manifold could be leaking aswell. Get urself a boost leak tester or make one.
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02-02-2007, 08:49 PM | #7 |
3" Exhaust
Join Date: Jul 2006
Location: Seattle, WA
Posts: 73
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I hear the turbo spooling, but the boost guage reads -4. I did not have boost when the exhaust was hooked up. Right now, I have the exhaust unhooked from the O2 housing back and I can hear the turbo spooling when I rev it up. I don't hear the leak anymore, but that could be because the exhaust is so damn loud. Im going to check the BOV, and my IC piping or the IC itself could be bad. The turbo is spooling but no boost showing up. I am afraid to drive the car with the exhaust unhooked. I am also going to check the vacuum hoses. Thanks for all the advice, I will hopefully solve this problem soon.
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1987 Supra Turbo GReddy TT Open Element Filter (<---not sure what brand) YAY BOOST!!!!....finally... |
02-03-2007, 02:22 AM | #8 | ||
3" Exhaust
Join Date: Oct 2005
Location: Tuscaloosa, AL
Posts: 53
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Quote:
i know you said you ain't boostin, but try ignoring the guage. stomp the gas and see if all you power comes at once or does it take a second before it kicks you in the ass?
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02-03-2007, 04:15 AM | #9 |
SP58GT
Join Date: Jul 2005
Location: USA
Posts: 633
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Your car won't build boost when there is no load, the turbo will still spin. This probably why you don't hear the noise with the downpipe disconnected. Its possible that your car is boosting and the gauge or sender is bad.
Inspect all your vacuum lines and Intercooler piping and let us know what you find. I might be able to take a look at it sometime next weekend.
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Nate |
02-03-2007, 05:00 AM | #10 |
1000whp postwhore
Join Date: Apr 2006
Location: Chi-Town
Posts: 1,643
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no load, no boost
Maybe that's why you think your not boostin, bcuz your not boostin
You been revving it at nuetral or park That's why there's no no boost If the gauge reads at -4 but not moving at all Its a bad sending unit If its broken the boost gauge will be at 0 constantly The hissing sound can be a bov problem Have you tried blowing on the bov If you can blow on it freely, that's most likely where you're problem lies
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